NIST SP 800-171 Consulting Services

NIST SP 800-171 consulting helps your business move from uncertainty to a clearly defined, audit-ready compliance posture with a risk register.

The process typically begins with a gap assessment, where your current environment is evaluated against all 110 NIST SP 800-171 requirements. This step identifies missing controls, weak implementations, and documentation gaps that could prevent compliance.

Following the assessment, a System Security Plan (SSP) is developed or refined. The SSP documents how your business meets each requirement and serves as the foundation for demonstrating compliance. Alongside the SSP, a Plan of Action and Milestones (POA&M) outlines any remaining gaps and provides a structured remediation plan.

From there, consulting efforts shift toward implementation and remediation. This includes deploying technical controls, strengthening policies, improving access management, and aligning processes with NIST requirements. The goal is not just to check boxes, but to build controls that work in real-world environments.

Finally, businesses move into continuous monitoring and readiness validation. This phase makes sure controls remain effective over time and prepares your company for future audits, including CMMC Level 2 assessments.

Who Needs NIST SP 800-171 Consulting?

NIST SP 800-171 consulting is necessary for companies that handle Controlled Unclassified Information or plan to pursue federal contracts.

Defense contractors (prime companies) and subcontractors (subs) are the most obvious candidates, as compliance is required under DFARS and CMMC. However, the scope extends further. Managed service providers, SaaS companies, engineering firms, and manufacturers often fall within scope because they support or interact with government systems or data.

Even companies not currently under contract may need to comply with NIST SP 800-171 if they plan to bid on federal opportunities. In many cases, demonstrating compliance is a prerequisite for winning business.

Businesses preparing for CMMC Level 2 certification will also need to align with NIST SP 800-171, which serves as the foundation for those requirements.

NIST SP 800-171 is structured around 14 control families, each addressing a specific aspect of cybersecurity.

Access control ensures that only authorized users can access systems containing CUI. Awareness and training focus on educating employees about security risks and responsibilities. Audit and accountability provide visibility into system activity through logging and monitoring.

Configuration management establishes secure system baselines, while identification and authentication verify user identities. Incident response ensures your business can detect, respond to, and recover from security events.

Other control families include maintenance, media protection, physical protection, personnel security, risk assessment, security assessment, system and communications protection, and system and information integrity. Together, these controls create a layered security approach that reduces risk and supports compliance.

The cost of NIST SP 800-171 consulting depends on your current security posture, the size of your environment, and how quickly you need to achieve compliance or CMMC certification.

For smaller businesses with limited infrastructure, costs typically range from $15,000 to $40,000 for assessments, documentation, and basic remediation. Mid-sized firms often invest between $50,000 and $150,000, especially when technical controls and external support are required.

Larger environments or companies preparing for CMMC Level 2 certification may see costs exceed $200,000, particularly when advanced monitoring, tooling, and ongoing support are involved.

Several factors influence cost. The scope and size of the environment, along with its existing maturity, are the most important factors. Businesses that already follow frameworks like CIS Controls or NIST CSF will require less effort to align with NIST SP 800-171. The complexity of your IT environment, the number of users and systems, and the need for third-party tools or services also impact total investment.

Many companies struggle with NIST SP 800-171 because they underestimate the level of detail required and the proper scope for an environment.

• One of the most common issues is incomplete or inaccurate documentation or policies. Businesses may have controls in place, but without a properly developed System Security Plan, they cannot demonstrate compliance.
• Another challenge is misunderstanding shared responsibility, particularly in cloud environments. Companies often assume their cloud provider covers all requirements, when in reality, many controls remain their responsibility.
• Continuous monitoring is another area where firms fall short. Initial implementation may be successful, but maintaining compliance requires ongoing effort, including log reviews, vulnerability management, and policy updates.
• Finally, businesses often delay remediation efforts. A POA&M is not a substitute for compliance, it is a temporary measure that must be actively managed and resolved.

How Tanner Security Helps You Achieve NIST SP 800-171 Compliance

Tanner Security provides hands-on NIST SP 800-171 consulting designed to deliver measurable results.

We begin with a detailed gap assessment to identify where your business stands today. From there, we develop a clear, prioritized roadmap that aligns with your operational needs and compliance goals.

Our team supports the development of your System Security Plan and POA&M, ensuring both are accurate, defensible, and aligned with audit expectations. We also assist with implementing technical and administrative controls to help your team avoid common pitfalls.

Because many of our clients are working toward CMMC Level 2 certification, we ensure your NIST SP 800-171 efforts directly support that objective. This focus reduces duplication and accelerates your path to certification. There are a few differences between CMMC vs NIST SP 800-171 compliance. 

Most importantly, we focus on practical implementation. Our goal is to help your business build a security program that not only meets compliance requirements but also protects your systems and data in real-world conditions.

If your company is pursuing federal contracts or preparing for CMMC Level 2, NIST SP 800-171 compliance is a critical requirement.

Tanner Security can help you assess your current environment, close compliance gaps, and build a defensible security program.